Barrel-boring machine.



No. 772,706. PATENTED 001". 18, 1904. A. H. M. DRIVER & G. NORMAN.

BARREL BORING MACHINE.- lrrmonmn FILED MAR. 31, 1903.

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orviz-arv Eva/6501 6 WITNESS ES I No. I I PATENTED OUT. 18, 1904:;

I H. M. DRIVER & G. NORMAN.

I BARREL BORING MACHINE.

APPLICATION IILEDMAR. 31, 1903. 10 MODEL I I a sums-sum 2.

6 a a. 0 W A, wfi a H m a m m w% W WITNES$ES I 170. 772,706. PATENTED007. 18, 1904.

'- A. H. M. DRIVERKL G. NORMAN.

' BARREL BORING MAGHINE. APPLICATION FILED MAR. 31, l9 03.

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7 s A F154. 7 7 Ti No. 772,706. i

. UNITED" STATES" AUGUSTUS HENRY Patented October 18,1904.

PATENT OF ICE;

MURRAY DRIVER AND GEORGE NORMAN, OF BIRMINGHAM, ENGLAND.

BARREL-BORING MACHINE.

SPECIFICATIONforming part of Letters Patent No. 772,706, dated October18, 1904.

Application filed March 31, 1903 To all whom it may concern:

Be it kn own that we, AUGUSTUS HENRY MUR RAY DRIVERv and GEORGE NORMAN,both subjects of the King of Great-Britain, residing at Small Heath,near the city of Birmingham, England, have invented certain new anduseful Improvements in Barrel-Boring Machines, of which the following isa specification.

This invention relates primarily to the boring of small bores of barrelsof small-arms, but is also applicable to the boring of other parts ofsmall-arms, such as bolt-holes.

The invention further relates to the fineboring or finishing ofpreviously-formed or 'rough bored holes in barrels of small-arms andother small-bored hollow or tubular articles; and the principal objectof the said invention as regards the fine-boring of gun-barrels is toproduce truly-cylindrical, straight, and parallel-sided finished holes,such being obtained by means of the special methods, machinery, andappliances hereinafter described. I The accompanying drawings representthe construction and arrangement of a duplex machine for fine-boringrifle-barrels in which a tensioned boring-bar is held stationary whilethe previously-drilled barrel is rotated and traversed for feed inaccordance with our invention.

Figure 1 represents a side elevation, and Fig. 2 a top side plan, of amachine, showing the driving mechanism, the barrel-feed carriage, andthe fixed anchor and tensioning brackets of the boring-bars. Fig. 3 is acrosssectional view taken upon the dotted line 00, Fig. 2. These threefigures show the general arrangement and relative dispositions of allthe principal parts of the machine, with theboring-bars in position anda pair of barrels'mounted upon the barrel-carriage ready to betraversed-over the cutters of the said bars. Fig. 4; represents, upon anenlarged scale, a side elevation, partially in section, of a part of themachine, showing portions of the gearing provided for driving round thebarrole and traversing the feed-slide, also the means for supplying theinside of one of the barrelsand its boring-bar with lubricant and thedirectly-driven hollow chuck for centervtensioned at one end.

Serial No. 150,452. (No model.)

ing and holding the one end of the barrel and guiding the boring-bar.Fig. 5' is a top side plan'of Fig. 4. Fig. 6 is a view of the cutter,showing the form of same and how it is attached to the halves of theboring-bar.

Fig. 7 represents, upon the same scale as Fig.

'6, an elevation of one of the fixed anchorbrackets, which is arrangedat one end of the machine for the attachment of the boring-bar, and alongitudinal vertical section of the tensioning anchor-bracket arrangedat the opposite end of the machine to the fixed bracket and to which theother end of the boring-bar is connected.

The same numerals ofreference lndlcate corresponding parts in theseveral figures of the drawings, which show a duplex machine adapted tofine-bore two barrels simultaneously; but as the parts provided for eachbarrel are simply duplicate arrangements duplicated parts are markedthroughout with the same numerals, and the machine is generallydescribed asthough it were asingle one for fine-boring only one barrelat a time.

.The main bed 20, on which the barrel-carriage 21 slides, ismounted-upon suitable standards and has'the fixed anchor-bracket 22 ofthe boring-bar 23 mounted at its left-hand end, together with thedriving and feed gearing, while the tensioning-bracket 24: of'theboring-bar is mounted atthe other or right hand extremity of themachine. The boringbar 24 is light, slender, and of long length, and ithas been found necessary to insure the satisfactory Working, owing tothe construction of the bar, that the said bar should be The barrel-feedcarriage is mounted to slide longitudinally upon screw-threaded shaft orwormed spindle 25, deriving its motion from the transmissiongear, themovement of the said screw being imparted to the carriage by anarrangement of mechanism which embodies a clutch device for stopping andstarting the feed. Thus at the front of the carriage is fixed aprojecting stud or spindle 26, whose inner end is coned at 27 and uponthis stud is mounted a wormwheel 28, whose teeth engage with the threadof the driving-screw and which is internally suitable ways or guides andis fed by a long Ice ' guides of the main bed.

coned at its inner side to correspond with the coned part of the stud. Ahand-wheel 29 is keyed to the sleeve or bush of the wormwheel, and alevered nut 30 and pressure-plate 31 are disposed upon the screwed outerextremity of the said stud. lVhen the lever is rotated to screw home thenut, the pressure against the end of the worm-wheel bush forces theconed surfaces of wheel and stud onto one another, and the worm-wheel isfrictionally locked to and is stationary with the carriage, and theteeth, which are for the time being in gear with the screw, act asportion of a nut, whereby the carriage with barrel is traversedlongitudinally upon the ways or In order to disconnect the carriage fromthe driving-screw and allow it to remain stationary during the time thata barrel is being placed in or removed from the machine or while anyadjustment is being performed, the lever-nutis turned back off thescrewed end of the stud and the wormwheel is liberated from itsfrictional connection with the carriage and is rotated idly withoutimparting or transmitting any motion from the driving-screw. \Vhen atthe end of its traverse, the parts of the clutch are unlocked and therotation of the hand-wheel which is keyed to the bush of the worm-wheeltakes the carriages back to the opposite end of the bed by the teeth ofthe said wheel running over the thread of the driving-screw, whichserves as a toothed rack. It is, however, to be understood that theinvention is not confined to this particular arrangement ofcarriage-driving and clutch mechanism, as the same may be varied or anyequivalent ar rangement may be employed in lieu thereof.

The barrel-carriage is provided with head and tail stocks 32 33,provided with hollow centers for centering the drilled barrel andguiding the boring-bar, and the head-stock has a hollow chuck or carrier34 for holding and driving the said barrel during the lineboringprocess. The tail-stock may, if necessary, be mounted, as shown. upon asupplementary slide-rest 35, adjustable longitudinall y upon the maincarriage toward or away from the head-stock, so as to admit of thedistance between the head and tail centers being varied to accommodatebarrels of various lengths. The tail-stock itself is provided with abush or sleeve 36, having a longitudinal adjustment by a sliding orscrewing action within the fixed bracket of the stock and provided witha cross clamping-pin 37 for locking same to the said bracket. carries arotatable centering-plug 38, which is hollow from end to end for theboring-bar to pass through, and thus acts as a guide for the said bar.The inner extremity of the said plug projects beyond the end of the bushor sleeve and toward the head-stock and is coned to engage with the endof the barrel. To'adjust and advance or retire the coned end Thisadjustable sleeve of the spindle into and out of the end of the barrel,it is either rotated (when adjusted by a screw action) or simply pushedinto position, after which it is locked by the cross clamping-pin, whichmay have pressure-l docks bearing upon a plain part of the sleeve, orany other equivalent frictional device may be employed in lieu thereof.With this arrangement of tail-stock the adjustable sleeve is heldstationary with the fixed bracket and serves as a rigid guide or bearingfor the boringbar; but as an alternative this end of the barrel may befixed within an internally-eoned or plain bearing or chuck, (similar tothat shown in connection with the head-stock.) The spindle iO of thehead-stock, which is a fixture to the top side of the traversing-arriage, is also hollowed for the boring-bar to pass through and beguided thereby and is rotated in suitable bearings, while the endopposed to the tail-stock is provided with the chuck 34:, which isinternally coned and into which the muzzle end (or breech end) of thebarrel is made fast after being truly centered by the said coning, sothat the barrel, chuck, and spindle rotate together while the boringoperation is being performed. The hollow spindle is driven by a pulley3.) and a band which passes over a long drum on an overhead shaft, thelength of this drum being equal to or greater than the traverse of thecarriage, and the band moves along this drum as the carriage advancesalong the bed. in addition to driving the spindle for rotating thebarrel the band-pulle also serves to transmit motion to the screw whichtraverses the carriage. For this purpose the hollow spindle is extendedbeyond the head-stock toward the left-hand end of the machine and isprovided with a worm il, gearing with a wormwheel il keyed to a smallcounter-shaft -12, directed umlerncath and at right angles to thehead-stock spindle. At the back end of the counter shaft is abevel-wheel 4-3, gearing with a second bevel-wheel i4, having a. busha5, rotating in a bearing 46, carried by an arm or extension at? fromthe traversing-carriage. This second bevel-wheel thus travels along withthe carriage and is thereby made to slide along a feathered shaft 48,carried by brackets 4C9, fixed at the back of the bed of the machine,the length of this shaft being sufiicient to admit of the bevel-wlmelmoving with the carriage througlmut the whole of the feed traverse.Motion is transmitted from the feathered coun ter-sha ft to thedriving-screw at the front of the machine by a suitable arrangement ofchange wheels and pinions disposed at the left-hand end of the bed, (seeFig. 2,) the ratio of the several wheels being in accordance with thespeeds at which the barrel is to be rotated relative 'to the rate of itstraverse motion along the llO machine and inaxial line" with the headand tail stocks of the traveling barrel-carriage is the fixedanchor-bracket 22 for rigidly affixing the one end'of the tensionedboring-bar. This bracket consists of a removable or detachable chuck 50,of any suitable pattern, adapted to grip and hold one end of theboring-bar'and having a shank or stem 51 adapted to lie within'a housing52, formed at the sumlO mit or other part of an upright or standardfixed to the'bed. of the machine. The chuck is locked or fixed withinthe housing by a swing-over clip 53, fastened by a nut and bolt or anyother equivalent device which will hold 5 the boring-bar rigidly andprevent its rota- ,tion relative to the barrel. When the clip is swungback, it admits of the chuck being unshipped or removed from itshousing-bodily ,with the boring bar. The bar tensioning 2O bracket 24 isfixed at th'e'opposite end of the machine in line with the fixedanchor-bracket and the head and tail stocks of the carriage, and theaxes of the chucks of both brackets are disposed in line withthe hollowcenter- 2 5 plug of the-carriage tail-stock and the hollow chuck of thehead-stock. The tensioningchuck is adapted to grip and hold therighthand end of the boring-bar, thus holding the boring-bit steady andinsuring the boring of an absolutely true and straight hole. Thetensioning strain is applied to the bracket 24:

by a spring, weight, or screw arrangement,

at the top of'a standard or other support. The

forward end of the sleeve is fitted'with a collared guide-bush 59,wherethrough the chuck- 4' shank works. and the right-hand extremity ofthe said shank is provided with a stop or collar 60 of; the samediameter as the interior of the sleeve. A strong spiral spring 61 isdisposed around the chuck-shank, with one end bearing against the collarof the guidebush, while the other end bears against the collar on theshank. the arrangement being such that the expansion of the spring tendsconstantly to pull the chuck and boring-bar 5 outward "or away from theanchor-bracket, and thus apply the tension. A cap 62 is screwed onto theright-hand end of the sleeve, and a tension-regulating screw 63 isdirected through the middle of it, with the inner end '5 5bearingqagainst' the outer side of the endcollar of thechuck-shank, sothat by advancing or retiring this screw and either compressing thespring or allowing it to expand more or less the tension applied to theboring-bar may- 'voir.

motion is prevented by collars at its opposite ends. With thisconstruction the chucks of both the anchoring-and the tensioningbrackets may be readily removed with the boringbar when necessary; butin the ordinary sequence of operations when the barrel-carriage hascompleted its traverse and the boring is completed the boring-bar isreleased from the chuck of the anchor-bracket, while the clip of thetensioning-bracket is unfastened to admit of the unshipping of the chuckbodily with the bar. The latter is then withdrawn longitudinally fromthe hollow spindles of the head and tail stocks and from the barrelwhich is centered between them, after which the barrel is freed ordisconnected from the centering-spindles andremoved.

Oil under pressure is forced by a pump through the hollow head-stockspindle and through the barrel up to the boring-bit to lubricate thecutters while in operation and to carry away the swarf which isdischarged with the oil through the open end of the tailstock spindleinto an.oil-trough formed. along the top of the main bed. In order tolead the oil into the head-stock spindle and also serve as a guide forthe shank of the boringbar, a ferrule and stuffing-box 64 is connectedto the lefthand end of the said spindle, the said, ferrule beingsupported by a small bracket 65 from the extension of thebarrelcarriage, and the outer end has a small cap I 66, with a centralopening throughwhich the b0ring-bar passes into the'interior of theferrule. The oil from a suitable force-pump is forced into the ferruleby a branch or nipple 67, extending from one side and connected with aflexible pipe leading to the oil-reser- The forward or inner end of theferrule is screwed and coupled by a union-nut 68 to a collared orshouldered and insidescrewed sleeve 69, which makes a detachableconnection between it and the correspondingly-wormed after end 70 of therotating head-stock spindle, and the opposed faces of ferrule and sleeveare recessed and fitted with a gland or packing 71, which may'consist ofone or more washers of wood, fiber, or other substance, a similarpacking 72 being fitted between the other end of the stuffing box andthe cap 66. 1

The stationary cutter or boring bit 7 3, which is solid, is carried atthe middle of the boring-bar and is so formed'that the forward end 7 4of same is the only part which acts as a'cutter, although it may or maynot have a pilot-cutter part 75 at the front. A trough or channel 76 ismade along the topside of the same for conducting the oil and swarf fromthe cutting-point, and the boring-bar is preferably made in two pieces77 78, whose inner terminations are connected, respectively, tothe'opposite ends of the cutter by screwing. The screw-nipples may beformed at each end of the'cutter with a depression &

in the top side to correspond with the channel or oil-gutter 76. Thesenipples are screwed into the open ends of the hollow boring-barsections, and when the diameter of the bar is practically the same asthe rough bore of the barrel under treatment the barsections themselvesmay be depressed or formed with channels corresponding to those in thecutter, thus forming continuous oilchannels along the boring-barsections and the cutter. These oil-channels may be of straight, spiral,or other form, as desired, with open ends for the admission and exit ofoil to and from the cutting parts. The cutter may have one or morestraight or spiral blades, but cutting upon the front edges only alikeunto a crown-cutter, or as an alternative it may be arranged withcutting edges alike unto boring-bits of the reamer type.

The boring-bar 24 is very light and slender and of such long length thatto hold its extremities between centers or fix it at both ends by rigidconnections it would be useless. The holding of the long and slender barin tension is to prevent any twisting or circumferential movement of thecutter and also to keep the sag out of the bar and hold it steady, whilethe cutter itself is of such shape that it assists in resisting thetwisting action of the cut. Thus after the fine boring operation isstarted and the cutter has entered the bore of the barrel the bar isonly supported by the tension applied to the ends and by the cutteritself in the middle part, and this method is found in practice toinsure admirable results as regards accuracy, rapidity, &c. The conedguide or the hollow coned center (designated by the reference character38) serves as a means for guiding and steadying the boringbar and cutterwhen the latter is about to enter the barrel or start the boringoperation and also as a support for one end of the barrel, which is freeto revolve thereon; but as soon as the whole of the cutter has enteredthe barrel the cutter itself will take upthe duty of supporting theboring-bar.

Before being placed within the machine the previously-drilled barrel maybe prepared by concentrically coning the opposite ends of the bore orthe outer ends of the barrel to take onto or into the hollow externallyor internally coned ends of the centering-plugs, and these coned partswould act as guide-bushes for the boring-bar, or these guides maybedispensed with and the end of the barrel-bore may be concentricallyrecessed to receive the boring-bit, so as to give a start for thecutters.

Many parts of the invention hereinbefore described may be applied toboring-machines, in which the boring-bars are not held in tension, butin which the rotating barrel is drawn or pushed over the cutter or thecutter is drawn or pushed through the rotating barrel. In each sucharrangement the parts removed at each out form the guide for theboring-bit.

The application of this invention to the boring of bolt-holes in thebodies of Lee-lCnlield and other bolt-action rifles, also for boring thetubes of naval guns and other ordnance, and other tubular articlesdifl'ers in no essential respect from its application to a machine forboring rifle-barrels, as herein described.

Having fully described our invention, what we desire to claim and secureby Letters latent is 1. In a machine of the character described, thecombination with a non-rotating boringbar provided with a cutter, and ananchorbracket attached to each end of said bar, of a traversingfeed-carriage located between the brackets, ahead and a tail stockmounted upon the carriage, a coned spindle carried by each of the stocksfor centering and supporting the article to be operated upon, means fordirectly driving the spindle of the head-stock thereby rotating thearticle to be operated upon, and a gearing connected with and operatedby the spindle of the head-stock for imparting movement to the carriage.

2. In a machine of the character described, the combination with anon-rotating boringbar provided with a cutter, and a feed-car riageprovided with a head and tail stock each carrying a hollow spindle forsup mrting and centering the article to be operated upon and for guidingthe bar, of means for lubricating the cutter and the inside of thearticle when the machine is in operation, said means comprising acombined Stuliing-box and boringbar guide-ferrule detachably connectedto and with the interior of the hollow spindle of the head-stock andprovided with partly tight end cap having a central opening which passesover the boring-bar as the carriage is traversed, said ferrule furtherprovided with means for the supply of a lubricant thereto.

3. A boring-machine involving a boringbar fixed at one end and havingmeans to longitudinally tension it applied to its other end.

4. A machine for line boring having a stationary non-rotating elongatedand slender boring-bar, and a tensioning device connected to one end ofsaid bar for applying longitudinal tension thereto.

5. A machine for line boring having a nonrotating elongated and slenderboring-bar, an anchor-bracket attached to one end of said bar, and atensioning device attached to the other end of said bar and :ulapted toapply longitudinal tension to the bar when the machine is operated.

6. A machine for line boring having an elongated and slender boring bar,an anchorbracket attached to one end of said bar, and a.tensioning-bracl et attached to the other end of said bar and adapted toapply longitiulimil tension to the bar when the machine is operated.

7. A machine for fine boring having a nonrotating elongated and slenderboring-bar, an anchor-bracket attached to one end of said bar, and aspring tensioning-bracket attached to the other end of said bar andadapted to apply longitudinal tension to said bar when the machine isoperated.

8. A machine for boring small-bored tubular articles having a long andslender non-rotating boring-bar provided with a cutter, ananchor-bracket attached to one end of said bar, a tensioning deviceattached to the other end of said bar, alongitudinally-movablefeed-carriage traveling between said-bracket andsaid tensioning device, said carriage adapted to carry the article to bebored'therewith, causing thereby the traversing of the article over saidcutter, and means carried by the carriage for rotating the articleoperated upon as it is traversing over said cutter. v

9. In a machine of the character described, the combination of astationary boring-bar provided with a cutter, means for anchoring oneend of the bar, a tensioning device' attached to the other end of thebar and adapted to apply longitudinal tension to said bar when themachine is' operated, a traversing carriage adapted to carry the articleto be operated upon and to cause the traversing of the article over thecutter, said cutter acting as a sup-' port for thesaid bar as thearticle traverses over the cutter, means carried by the carriage forrotating the article operated upon as it traverses over said cutter, anda hollow coned guide carried by the carriage and adapted to guide andsteady the boring-bar and cutter when the latter is about to enter thearticle and to act as a support for one end of the article.

'10. In amachine of the character described, the combination of astationary'boring-bar provided with a cutter, a supporting means foreach end of the bar, alongitudinally-movable feed-carriage travelingbetween the said supporting means, hollow spindles mounted on thecarriage and adapted to support be tween them the article to be operatedupon, said carriage adapted to cause the traversing of the articleoperated upon over said cutter, and means for driving one of the saidspindles, causing thereby the rotation of the article as it traversesover the cutter of the boringbar.

11. Inamachine of the character described, the combination of astationary boring-bar provided with a cutter, an anchor-bracket for oneend of said bar, a tensioning-bracket for the other end of the bar,said. tensioningbracket adapted to apply longitudinal tension to saidbar when the machine is operated, a

longitudinally-movable feed-carriage traveling between-the saidbrackets, hollow spindles mounted on the carriage and adapted to supportbetween them the article to be operated upon, said carriage adapted tocause the said cutter, and means for driving one of the said spindles,causing thereby the rotation of the article as it traverses over thecutter of the boring-bar.

12. In a machine of the character described, an elongated'and slenderstationary boring-bar provided with a cutter, an anchor-bracket attached to one end of said bar, a tensioningbracket connected with theother end of said bar and adapted to apply longitudinal tension to thebar when the machine is operated, a longitudinally-movable feed-carriagetraveling between said brackets, and adapted to carry the articleoperated upon and to cause said article to traverse over said cutter, astationary head, an adjustable tail-stock mounted upon said carriage,coned spindles carried by said stock and adapted to support the articleto be operated upon, and means for directly driving. one of the saidspindles, causing thereby the rotation of the article operated upon asit traverses over the cutter, said driving-spindle adapted to center andsupport the article operated upon and further adapted to form a guidefor the boring-bar over which the spindles traverse as thecarriage-travels.

' 13. A machine of the character described having a non-rotatingboring-bar provided with "a cutter, anchor-brackets attached to bracketsand adapted to cause the work which is operated upon to traverse oversaid cutter,

externally-coned hollow spindles mounted on the carriage and adapted tosupport between them the article to be operated upon, and means fordriving directly one of the said spindles, causing thereby the rotationof the article as it traverses over the cutter.

14. A machine of the character described having a non-rotatingboring-bar provided with a cutter, anchor-brackets attached to each endof said bar, a longitudinally-movable feed carriage traveling betweenthe brackets and adapted to cause the workwhich is operated upon totraverse over said cutter, externally-coned hollow spindles mounted onthe carriage and adapted to support between them the article to beoperated upon, means for driving directly one of the said spindles,causing thereby the rotation of the article as it traverses over thecutter, and means for applying longitudinal tension to said bar as themachine is operated.

In testimony whereof we have hereunto set our hands in presence of twosubscribing witnesses.

' AUGUSTUS HENRY MURRAY DRIVER.

GEORGE NORMAN. p

Witnesses HENRY SKERRETT, ARTHUR SADLER.

